Global Patent Index - EP 1349284 A3

EP 1349284 A3 20031008 - Apparatus and methods for digital-to-analog conversion

Title (en)

Apparatus and methods for digital-to-analog conversion

Title (de)

Vorrichtung und Verfahren zur Digital-Analog-Wandlung

Title (fr)

Appareil et procédé pour la conversion numérique-analogique

Publication

EP 1349284 A3 20031008 (EN)

Application

EP 03006234 A 20030320

Priority

US 10983402 A 20020329

Abstract (en)

[origin: EP1349284A2] An apparatus for converting a digital input signal to an analog signal for transmission. The input signal can include more than one carrier signal. A plurality of delta-sigma modulation loop circuits are connected in an increasing order of operating frequency so as to reduce a word length of the input signal. A tuning circuit adjusts the signal frequency to a transmitting frequency for conversion to analog by a digital-to-analog converter. A first loop circuit is implemented using CMOS gates, and a second loop circuit and the tuning circuit are implemented using indium phosphide gates. The apparatus allows a high-resolution, wide-band RF multiple-carrier signal to be re-quantized to a lower-resolution signal while an acceptable signal-to-noise ratio is maintained. <IMAGE>An apparatus for converting a digital input signal to an analog signal for transmission. The input signal can include more than one carrier signal. A plurality of delta-sigma modulation loop circuits are connected in an increasing order of operating frequency so as to reduce a word length of the input signal. A tuning circuit adjusts the signal frequency to a transmitting frequency for conversion to analog by a digital-to-analog converter. A first loop circuit is implemented using CMOS gates, and a second loop circuit and the tuning circuit are implemented using indium phosphide gates. The apparatus allows a high-resolution, wide-band RF multiple-carrier signal to be re-quantized to a lower-resolution signal while an acceptable signal-to-noise ratio is maintained. <IMAGE>

IPC 1-7

H03M 3/02

IPC 8 full level

H03M 3/02 (2006.01); H04L 5/02 (2006.01); H04L 27/26 (2006.01)

CPC (source: EP KR US)

H03M 3/00 (2013.01 - KR); H03M 7/302 (2013.01 - EP US); H04L 5/023 (2013.01 - EP US); H04L 27/2627 (2013.01 - EP US); H03M 3/50 (2013.01 - EP US)

Citation (search report)

  • [A] SPLETT A ET AL: "Solutions for highly integrated future generation software radio basestation transceivers", PROCEEDINGS OF THE IEEE 2001 CUSTOM INTEGRATED CIRCUITS CONFERENCE. (CICC 2001). SAN DIEGO, CA, MAY 6 - 9, 2001, IEEE CUSTOM INTEGRATED CIRCUITS CONFERENCE.CICC, NEW YORK, NY: IEEE, US, vol. CONF. 23, 6 May 2001 (2001-05-06), pages 511 - 518, XP010546942, ISBN: 0-7803-6591-7
  • [A] EFSTATHIOU D: "SoftCell/sup TM/: a multi-carrier transceiver solution for multi-mode base-stations", 11TH IEEE INTERNATIONAL SYMPOSIUM ON PERSONAL INDOOR AND MOBILE RADIO COMMUNICATIONS. PIMRC 2000. PROCEEDINGS (CAT. NO.00TH8525), PROCEEDIGNS OF 11TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATION, LONDON, UK, 18-21 SEPT., 2000, Piscataway, NJ, USA, IEEE, USA, pages 469 - 473 vol.1, XP010520681, ISBN: 0-7803-6463-5
  • [A] BINDRA A: "WIDEBAND DAC FOSTERS MULTICARRIER, MULTIMODE TRANSMISSION NOVEL 150-MSAMPLE/S, 14-BIT SEGMENTED-CURRENT-SOURCE DAC BOASTS 75-DB SFDR OVER 25-MHZ CELLULAR BANDWIDTH", ELECTRONIC DESIGN, PENTON PUBLISHING, CLEVELAND, OH, US, vol. 47, no. 12, 14 June 1999 (1999-06-14), pages 37 - 38,40, XP000920158, ISSN: 0013-4872
  • [A] JENSEN J F ET AL: "A 3.2-GHZ SECOND-ORDER DELTA-SIGMA MODULATOR IMPLEMENTED IN INP HBT TECHNOLOGY", IEEE JOURNAL OF SOLID-STATE CIRCUITS, IEEE INC. NEW YORK, US, vol. 30, no. 10, 1 October 1995 (1995-10-01), pages 1119 - 1127, XP000536375, ISSN: 0018-9200
  • [A] VANKKA J ET AL: "A MULTICARRIER QAM MODULATOR", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II: ANALOG AND DIGITAL SIGNAL PROCESSING, IEEE INC. NEW YORK, US, vol. 47, no. 1, January 2000 (2000-01-01), pages 1 - 10, XP001004646, ISSN: 1057-7130

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

DOCDB simple family (publication)

EP 1349284 A2 20031001; EP 1349284 A3 20031008; EP 1349284 B1 20050601; DE 60300738 D1 20050707; DE 60300738 T2 20060504; JP 2003304157 A 20031024; JP 4266684 B2 20090520; KR 20030078642 A 20031008; US 2003185288 A1 20031002; US 7031395 B2 20060418

DOCDB simple family (application)

EP 03006234 A 20030320; DE 60300738 T 20030320; JP 2003093614 A 20030331; KR 20030010334 A 20030219; US 10983402 A 20020329